欢迎来到牛牛题库网 牛牛题库官网
logo
搜索
全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶动力装置

单项选择题

The mechanical efficiency of an engine （） because losses occur in the form of friction.

A.is always less than 100%
B.is always more than 100%
C.is always equal to 90%
D.is always less than 90%

点击查看答案&解析
上一题 目录 下一题

相关考题

单项选择题
The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.

A.principle
B.principal
C.cause
D.case
单项选择题
The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.

A.two-stroke
B.four-stoke
C.long-stroke
D.short-stroke
单项选择题
The main moving parts of a diesel engine consist of the （） and the pistons.

A.bedplate, connecting rods
B.crankshaft, the connecting rods
C.frames, crossheads
D.crankshaft, the cylinder
微信小程序免费搜题

All Rights Reserved 版权所有©牛牛题库网(nntiku.com)

备案号：湘ICP备2022003000号-1

微信扫一扫,加关注免费搜题

微信扫一扫,加关注免费搜题